Arc-lamp.



P. HANISGH & J. ROSEMEYER.

ARC LAMP.

APYLIOATION FILED JAN.28,1909

Patented Apr. 16, 1912.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

PAUL HANISCH, OF COLOGNE, AND JOSEF ROSEMEYER, OF COLOGNE-LINDENTHAL GERMANY.

ARC-LAMP.

To all coho 1226i may concern Be it known that we, PAUL HAxison, a subject of the Emperor of Germany, residing at Cologne-onthe-Rhine, Germany, and

Josnu ROSEMEYER, a subject of the Emperor of Germany, residing at Cologne-Lindenthal, Germany, have invented a new and useful In'iprovemcnt in Arc-Lamps, of which the following is a specification.

This invention relates to an arc lamp having downwardly directed carbons, and it has for its object a new arrangement for controlling the adjustment of the carbons as they burn away.

According to this invention one of the two carbons, which are mechanically connected at their upper ends, rests by its lower end against a support and acts either by its pressure on the support or indirectly through the closing of an electric circuit to operate a brake mechanism which supports the carbons until they burn away so as to tend to leave av gap between the one carbon and its support. If the support is movable it will then turn so as to follow the carbon, or it the support is fixed the contact between it and the carbon will be broken. In either case the brake mechanism is actuated so as to permit the two carbons moving downward until the one of them again rests prop crly upon the support. The brake mechanism is thereupon thrown into action so as to hold up the carbons until the next release takes place.

In the accompanying drawings, Figures 1 and 2 show in vertical elevation an arc lamp constructed according to this invention. Fig. 1 illustrates the lamp before the current is switched on, the guiding rod being removed tor the sake of better illustration of the other parts, and Fig. 2 shows the lamp in the burning position, the guide rods also be- I mg omitted for the same purpose. Fig. 3 is a plan view of the carbon cross guide with the vertical guides in cross section. Figs. 4, 5 and 6 show modified forms of construction according to the invention, Fig. 6 being a diagram of connections of the form according to Fig. 5.

In all the figures, the two carbons are marked 1 and 2, and these carbons are arranged to move in a vertical direction while they are so connected mechanically the one with the other that their points must burn away equally. The one carbon is always Specification of Letters Patent.

Application filed January 28, 1909.

Patented Apr. 16, 1912. Serial No. 474,725.

caused to move vertically while the other is arranged to turn or pivot for striking the are so as to bring its point against that of the other carbon so long as no current is flowing through the lamp. As soon, however, as the current is switched on, it passes through the points of the carbons while an electromagnet or solenoid 3 is actuated, caus ing the movable carbon 2 to turn and to come into the burning position shown in Fig. 2 as described below. For guiding the carbon 1, a cross piece 4 is provided, arranged to move between vertical guides 5 and 6. The carbon 2 has a swinging movement in the opening in the burner plate 7 through which said carbon passes. On the carbon holder 8 of the pivoting carbon, is fixed an areshaped bar 9 which engages with the carbon holder 10 of the other carbon 1. In order to reduce the friction between the parts, a roller 11 is preferably provided for the bar 9 to work over. The movement of the carbon 2 is limited by a stop 12 fixed beneath the cross piece 4. Vi e should consider a reversal of this arrangement as fully within the scope of our invention. The electromagnet or solenoid 3 effects the movement of the carbon 2 when the current is switched on, by the intermediary of a rod 13 connected to an elbow lever lat pivoted at 17 on a fixed support. The lever 13 is connected by a link 15 to a rod 16 which is pivoted at 18 and slides through a guiding hole in the carbon. holder 8 of the carbon 2. The draw ing up of the rod 13 by the elect-romagnet or solenoid causes the parts to move from the position of Fig. 1 to that of Fig. 2 by which the lower ends of the carbons are separated, the carbon 2 moving parallel to the rod 16.

The most important part of the invention rests in the device controlling the adjust ment of the carbons as they burn away. A supporting piece 19 projects beneath the carbon 1 which only moves vertically. Both the carbons are held in a vertical direction by means of a brake 20 so long as the car bon 1 rests with its point against the support 19. As soon, however, as there is a tendency to form a small gap between the carbon and the support as the former burns away, the brake is released to such an extent that the carbons are allowed to fall. until the carbon 1 again rests properly upon its support.

Various arrangements can be used for actuating the brake; in the construction shown hung on a lever 27 pivoting about a fixed in Figs. 1, 2 and 6, the rod 21 actuated by pointv 28 so thatas the carbons burn away an electromagnet or solenoid 22 moves the the lever can turn a little; the movement of brake block while the circuit of 22 is a shunt l the lever is utilized to open and close an on the lamp terminals which is kept closed electric contact between the part 30 atas long as the carbon 1 rests on its support, tached to the lever and the part 31 suitably but is broken when the carbon burns away fixed in the lamp. The contacts 30 and 31 so as to tend to leave the support. In other are included in the shunt circuit of an eleccases the support may be made movable so tromagnet or solenoid 22 by which the brake that it tends to follow the point of the ear- 20 is actuated through a link 21 as indicated bon as this latter burns away, and this moy in Fig. (3. The contacts 30 and 31 might tion can be made by suitable means to conof course be arranged in any other conventrol the brake as hereinafter :t'urthcr exient way. A very small amount of burning plained. Fig. 7 shows such construction. y away of the carbon sutlices to permit the Finally the one device may be combined. support 19 to move sutliciently to break the with the other in such a way that the movcontact between 30 and and so to cause able support controls contact points arthe brake to be released. ranged in any suitable position to open and The constructions hereinhe'tore described close the circuit of the electromagnet or soand illustrated in the accompanying drawlenoid controlling the brake. This modified ing are intended to serve as examples acconstruction is illustrated in Fig. 5 and is cording to this invention, the scope of hereinafter explained. which is defined by the following claims.

lVhen the brake is actuated by an elec- \Vhat we claim is: troinagnet, the position of the brake and the In an arc lamp having downwardl' tllmanner in which it controls the movement rected carbons, one of said carbons being of the carbons may be very various. The pivotally mounted. to strike the are and the brake may act directly on one of the carbons other mounted for vertical movement, an as illustrated for example in Figs. 1, 2, and arc-shaped bar on the carbon holder of the 6, or it may act upon a drum 23 as is shown pivoted carbon adapted to engage the carin Fig. 1, over which drum a chain 21 passes bon holder or the vertically movable carsupporting the carrier t of the carbons. hon, means for limiting the movement of The electromagnet 25 releases or applies v the pivoted carbon, an elbow lever pivotally the brake according as the carbon 1 ceases mounted on a fixed support, an eleetro-magto rest upon the support 19 or rests etliciently net, a rod connecting said magnet with said thereon. The shunt circuit for the electroelbow lever, a link connected to said elbow magnet will be evident at once from the lever, and a pivotally mounted rod condrawing. The arrangementof the brake nected with said link and mounted to slide device and ot the electromagnet can ob viously be modified in a great many ways through an opening in the carbon holder without departing from the invention.

of the pivoted carbon.

When a fixed support 19 is used, this is In testimony whereof we have signed our names to this specification in the presence preferably held by means of a bracket 2t) on the burner plate 7. y l

of two subscribing witnesses.

, T 1 1 When the mechanical device for controlgglg fiu f aggx l l l y ling the brake is combined with the electrox l magnetic device, the arrangement may be l substantially that illustrated by Figs. 5 and 6. The support 19 is in this case again l lVitnesses Louis i iiivnouv, H. J. DUNLAP.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents. Washington, D. C. 

